2 problems

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The numerical-range conjecture for periodic tridiagonal operators
The numerical-range conjecture.
Conjectureopennumerical-range operator-theory tridiagonal-operatorsarXiv posted 2 days ago
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Density of spectra from periodic sequences in finite-type subshifts
Let $b\in\mathcal A^{\mathbb Z}$ , let $X_b$ be the subshift generated by $b$ , and let $A_b$ be the associated tridiagonal operator. Suppose that $X_b$ is of finite type, and for ea…
Conjectureopenspectral-theory symbolic-dynamics tridiagonal-operatorsarXiv posted 2 days ago

The numerical-range conjecture for periodic tridiagonal operators